Bought my first MSR XGK in 1982. It's been everywhere from Alaska to the Himalaya, burning anything resembling fuel. Cranks out more heat than a kitchen stove burner. The new one for my bugout bag is even better than the old one. Flexible fuel line means the failure mode of the old one is fixed (metal fatigue cracks fuel tube weld at burner cup), and the new one is more compact. I suspect the new XGK will outlast me... Tip for simmering at a low heat: keep fuel valve 3/4 open to prevent flame-out, but do not pump the stove to full pressure: takes practice but it works. Mostly though this is a stove to melt snow and boil it FAST: beats everything else in the backpacking category by a wide margin. Sit it on a cheap hot plate when cooking if the surface underneath might be flammable.
Awesome stove that works great at boiling water and making rice and oatmeal . If you get the diffuser plate like the one that comes with the military one you can cook more types of food
This Stove is really good at boiling water or melting snow for water. If you’re looking to cook with variable flame, then this stove is not for you you might want the dragonfly. 
But for fast boils this stove can’t be beat.
It’s a jet engine. Love it.